8780840 has 64 divisors (see below), whose sum is σ = 21546000. Its totient is φ = 3207168.

The previous prime is 8780833. The next prime is 8780851. The reversal of 8780840 is 480878.

It can be written as a sum of positive squares in 8 ways, for example, as 7695076 + 1085764 = 2774^2 + 1042^2 .

It is a super-2 number, since 2×8780840² = 154206302211200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8780840.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24986 + ... + 25334.

Almost surely, 2^8780840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8780840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10773000).

8780840 is an abundant number, since it is smaller than the sum of its proper divisors (12765160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8780840 is a wasteful number, since it uses less digits than its factorization.

8780840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414 (or 410 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 35.

The square root of 8780840 is about 2963.2482177502. The cubic root of 8780840 is about 206.3060771914.

The spelling of 8780840 in words is "eight million, seven hundred eighty thousand, eight hundred forty".